Dynamic electrical properties of polymer-carbon nanotube composites: Enhancement through covalent bonding

被引：0

作者：

Curran S.A. ^{[1
]}

Zhang D. ^{[1
]}

Wondmagegn W.T. ^{[1
]}

Ellis A.V. ^{[2
]}

Cech J. ^{[3
]}

Roth S. ^{[3
]}

Carroll D.L. ^{[4
]}

机构：

[1] New Mexico State University, Department of Physics, Las Cruces

[2] Gracefield Research Centre, Industrial Research Ltd.

[3] Max Planck Institute for Solid State Research

[4] Department of Physics, Wake Forest University, Winston-Salem

来源：

Journal of Materials Research | 2006年 / 21卷 / 4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1557/jmr.2006.0129

中图分类号：

学科分类号：

摘要：

Composite formation between carbon nanotubes and polymers can dramatically enhance the electrical and thermal properties of the combined materials. We have prepared a composite from polystyrene and multi-walled carbon nanotubes (MWCNT) and, unlike traditional techniques of composite formation, we chose to polymerize styrene from the surface of dithiocarboxylic ester-functionalized MWCNNs to fabricate a unique composite material, a new technique dubbed "gRAFT" polymerization. The thermal stability of the polymer matrix in the covalently linked MWCNT-polystyrene composite is significantly enhanced, as demonstrated by a 15 °C increase of the decomposition temperature than that of the noncovalently linked MWCNT-polystyrene blend. Thin films made from the composite with low MWCNT loadings (<0.9 wt%) are optically transparent, and we see no evidence of aggregation of nanotubes in the thin film or solution. The result from the conductivity measurement as a function of MWCNT loadings suggests two charge transport mechanisms: charge hopping in low MWCNT loadings (0.02-0.6 wt%) and ballistic quantum conduction in high loadings (0.6-0.9 wt%). The composite exhibits dramatically enhanced conductivity up to 33 S m-1 at a low MWCNT loading (0.9 wt%). © 2006 Materials Research Society.

引用

页码：1071 / 1077

页数：6

共 52 条

[41] Satishkumar B.C., Govindaraj A., Mofokeng J., Subbanna G.N., Rao C.N.R., Novel experiments with carbon nanotubes: Opening, filling, closing and functionalizing nanotubes, J. Phys. B: At. Mol. Opt. Phys., 29, (1996)
[42] Zhang N., Xie J., Varadan V.K., Functionalization of carbon nanotubes by potassium permanganate assisted with phase transfer catalyst, Smart Mater. Struct., 11, (2002)
[43] Sudalai A., Kanagasabapathy S., Benicewicz B.S., Phosphorus pentasulfide: A mild and versatile catalyst/reagent for the preparation of dithiocarboxylic esters, Org. Lett., 2, (2000)
[44] Fourier J., Boiteax G., Seytre G., Marichy G., Percolation network of polypyrrole in conducting polymer composites, Synth. Met., 84, (1997)
[45] Meincke O., Kaempfer D., Weickmann H., Friedrich C., Vathauer M., Warth H., Mechanical properties and electrical conductivity of carbon-nanotube filled polyamide-6 and its blends with acrylonitrile/butadiene/styrene, Polymers, 45, (2004)
[46] Potschke P., Bhattacharyya A.R., Janke A., Melt mixing of polycarbonate with multi-walled carbon nanotubes: Microscopic studies on the state of dispersion, Eur. Polym. J., 40, (2003)
[47] Foygel M., Morris R.D., Anez D., French S., Sobolev V.L., Theoretical and computational studies of carbon nanotube composites and suspensions: Electrical and thermal conductivity, Phys. Rev. B, 71, (2005)
[48] Carmona F., Mouney C., Temperature-dependent resistivity and conduction mechanism in carbon particle-filled polymers, J. Mater. Sci., 27, (1992)
[49] Langer L., Bayot V., Grivei E., Issi J.-P., Heremans J.P., Olk C.H., Stockman L., Haesendonck C., Bruynseraede Y., Quantum transport in a multi-walled carbon nanotube, Phys. Rev. Lett., 76, (1996)
[50] Chico L., Benedict L.X., Louie S.G., Cohen M.L., Quantum conductance of carbon nanotubes with defects, Phys. Rev. B, 54, (1996)

← 1 2 3 4 5 6 →